Lincoln Electric SVM 122-A service manual Test Perform the SCR/Diode Rec Tifier Bridge Test

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F-9		F-9
	TROUBLESHOOTING & REPAIR
	TROUBLESHOOTING GUIDE	Observe Safety Guidelines
		detailed in the beginning of this manual.

PROBLEMS	POSSIBLE AREAS OF	RECOMMENDED
(SYMPTOMS)	MISADJUSTMENT(S)	COURSE OF ACTION
	OUTPUT PROBLEMS
The machine does not have maxi-	1. Make certain the correct three-	1.	Check	the		Output	Control
mum output.	phase input voltage is being		potentiometer			(R4).	Normal
	applied to the machine.		resistance		is	10,000	ohms.
	2. If remote control is being used,		Also check		associated wiring
			for loose or faulty connections.
	set the Output Control switch
			See Wiring Diagram.
	(S2) in the OUTPUT CONTROL
	“LOCAL” position and control	2.	Check the welding Mode switch
	the weld output with the		(S4), the microswitches, and the
	machine Control potentiometer		associated wiring.
	(R4). If the problem is solved,	3.	Check	the		Output	Control
	check the remote control unit
			switch	(S2)		and associated
	(or wire feeder) and associated
			wiring. See Wiring Diagram.
	control cable.
		4.	Perform the Main Transformer
			Test.
		5.	Perform the SCR/Diode Rec-
			tifier Bridge Test.
		6.	The control board may be
			faulty. Replace.

CAUTION

If for any reason you do not understand the test procedures or are unable to perform the test/repairs safely, con- tact the Lincoln Electric Service Department for electrical troubleshooting assistance before you proceed. Call 216-383-2531 or 1-800-833-9353.

IDEALARC DC-400

LINCOLN ®

ELECTRIC